Meth is legal in certain guises like medication such as sudafed, pain inhibitors and sleeping pills but the drug even in a different (pseudo) form, in extremely low dosages and treated by professional chemists, yet people still get addicted to them.
If thats not enough evidence on how addictive they are then yeh you are not in touch with the facts, are in denial, or think "you have a handle on it" but the reality is thats a clear sign that its already started to alter your perception. People who did it casually 15 years ago are starting to show psychological problems like psychosys, dillusion issues, anger problems, depression, anxeity, cognitive issues, siezures just to name a few.
Marajuana is a gateway drug (one that leads to people taking other kinds of drugs) and if grown by dealers who add in other chemicals to enhance the effects causes psychosis.
So thats why they will never be legalized.
Anyone who has used the stuff, this is worth a read...
http://www.drugabuse.gov/publication...ethamphetamine